linux-kernel - [PATCH v2 061/101] fbdev/ps3fb: Duplicate video-mode option string

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Message-Id: <20230309160201.5163-62-tzimmermann@suse.de>
Date:   Thu,  9 Mar 2023 17:01:21 +0100
From:   Thomas Zimmermann <tzimmermann@...e.de>
To:     deller@....de, geert+renesas@...der.be, timur@...nel.org,
        rdunlap@...radead.org, paulus@...ba.org, benh@...nel.crashing.org,
        linux@...linux.org.uk, pjones@...hat.com, adaplas@...il.com,
        s.hauer@...gutronix.de, shawnguo@...nel.org, mbroemme@...mpq.org,
        thomas@...ischhofer.net, James.Bottomley@...senPartnership.com,
        sudipm.mukherjee@...il.com, teddy.wang@...iconmotion.com,
        corbet@....net
Cc:     linux-fbdev@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org,
        Thomas Zimmermann <tzimmermann@...e.de>
Subject: [PATCH v2 061/101] fbdev/ps3fb: Duplicate video-mode option string

Assume that the driver does not own the option string or its substrings
and hence duplicate the option string for the video mode. Allocate the
copy's memory with kstrdup() and free it in the module's exit function.

Done in preparation of switching the driver to struct option_iter and
constifying the option string.

v2:
	* replace static memory with kstrdup()/kfree() (Geert)

Signed-off-by: Thomas Zimmermann <tzimmermann@...e.de>
---
 drivers/video/fbdev/ps3fb.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/drivers/video/fbdev/ps3fb.c b/drivers/video/fbdev/ps3fb.c
index 2fe08b67eda7..d67ef2701b18 100644
--- a/drivers/video/fbdev/ps3fb.c
+++ b/drivers/video/fbdev/ps3fb.c
@@ -260,6 +260,7 @@ static const struct fb_videomode ps3fb_modedb[] = {
 static int ps3fb_mode;
 module_param(ps3fb_mode, int, 0);
 
+static char *mode_option_buf;
 static char *mode_option;
 
 static int ps3fb_cmp_mode(const struct fb_videomode *vmode,
@@ -1276,8 +1277,11 @@ static int __init ps3fb_setup(void)
 			continue;
 		if (!strncmp(this_opt, "mode:", 5))
 			ps3fb_mode = simple_strtoul(this_opt + 5, NULL, 0);
-		else
-			mode_option = this_opt;
+		else {
+			kfree(mode_option_buf);
+			mode_option_buf = kstrdup(this_opt, GFP_KERNEL); // ignore errors
+			mode_option = mode_option_buf;
+		}
 	}
 	return 0;
 }
@@ -1294,6 +1298,7 @@ static void __exit ps3fb_exit(void)
 {
 	pr_debug(" -> %s:%d\n", __func__, __LINE__);
 	ps3_system_bus_driver_unregister(&ps3fb_driver);
+	kfree(mode_option_buf);
 	pr_debug(" <- %s:%d\n", __func__, __LINE__);
 }
 
-- 
2.39.2